1 /* PPC GNU/Linux native support.
3 Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
4 2003 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 #include "gdb_string.h"
30 #include <sys/types.h>
31 #include <sys/param.h>
34 #include <sys/ioctl.h>
37 #include <sys/procfs.h>
38 #include <sys/ptrace.h>
40 /* Prototypes for supply_gregset etc. */
45 #define PT_READ_U PTRACE_PEEKUSR
48 #define PT_WRITE_U PTRACE_POKEUSR
51 /* Default the type of the ptrace transfer to int. */
52 #ifndef PTRACE_XFER_TYPE
53 #define PTRACE_XFER_TYPE int
56 /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a
57 configure time check. Some older glibc's (for instance 2.2.1)
58 don't have a specific powerpc version of ptrace.h, and fall back on
59 a generic one. In such cases, sys/ptrace.h defines
60 PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that
61 ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and
62 PTRACE_SETVRREGS to be. This also makes a configury check pretty
65 /* These definitions should really come from the glibc header files,
66 but Glibc doesn't know about the vrregs yet. */
67 #ifndef PTRACE_GETVRREGS
68 #define PTRACE_GETVRREGS 18
69 #define PTRACE_SETVRREGS 19
72 /* This oddity is because the Linux kernel defines elf_vrregset_t as
73 an array of 33 16 bytes long elements. I.e. it leaves out vrsave.
74 However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return
75 the vrsave as an extra 4 bytes at the end. I opted for creating a
76 flat array of chars, so that it is easier to manipulate for gdb.
78 There are 32 vector registers 16 bytes longs, plus a VSCR register
79 which is only 4 bytes long, but is fetched as a 16 bytes
80 quantity. Up to here we have the elf_vrregset_t structure.
81 Appended to this there is space for the VRSAVE register: 4 bytes.
82 Even though this vrsave register is not included in the regset
83 typedef, it is handled by the ptrace requests.
85 Note that GNU/Linux doesn't support little endian PPC hardware,
86 therefore the offset at which the real value of the VSCR register
87 is located will be always 12 bytes.
89 The layout is like this (where x is the actual value of the vscr reg): */
93 |.|.|.|.|.....|.|.|.|.||.|.|.|x||.|
94 <-------> <-------><-------><->
99 #define SIZEOF_VRREGS 33*16+4
101 typedef char gdb_vrregset_t
[SIZEOF_VRREGS
];
103 /* For runtime check of ptrace support for VRREGS. */
104 int have_ptrace_getvrregs
= 1;
109 return (sizeof (struct user
));
113 /* registers layout, as presented by the ptrace interface:
114 PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
115 PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
116 PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
117 PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
118 PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
119 PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
120 PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
121 PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
122 PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
126 ppc_register_u_addr (int regno
)
129 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
130 int wordsize
= tdep
->wordsize
;
132 /* General purpose registers occupy 1 slot each in the buffer */
133 if (regno
>= tdep
->ppc_gp0_regnum
&& regno
<= tdep
->ppc_gplast_regnum
)
134 u_addr
= ((PT_R0
+ regno
) * wordsize
);
136 /* Floating point regs: eight bytes each in both 32- and 64-bit
137 ptrace interfaces. Thus, two slots each in 32-bit interface, one
138 slot each in 64-bit interface. */
139 if (regno
>= FP0_REGNUM
&& regno
<= FPLAST_REGNUM
)
140 u_addr
= (PT_FPR0
* wordsize
) + ((regno
- FP0_REGNUM
) * 8);
142 /* UISA special purpose registers: 1 slot each */
143 if (regno
== PC_REGNUM
)
144 u_addr
= PT_NIP
* wordsize
;
145 if (regno
== tdep
->ppc_lr_regnum
)
146 u_addr
= PT_LNK
* wordsize
;
147 if (regno
== tdep
->ppc_cr_regnum
)
148 u_addr
= PT_CCR
* wordsize
;
149 if (regno
== tdep
->ppc_xer_regnum
)
150 u_addr
= PT_XER
* wordsize
;
151 if (regno
== tdep
->ppc_ctr_regnum
)
152 u_addr
= PT_CTR
* wordsize
;
154 if (regno
== tdep
->ppc_mq_regnum
)
155 u_addr
= PT_MQ
* wordsize
;
157 if (regno
== tdep
->ppc_ps_regnum
)
158 u_addr
= PT_MSR
* wordsize
;
159 if (regno
== tdep
->ppc_fpscr_regnum
)
160 u_addr
= PT_FPSCR
* wordsize
;
166 ppc_ptrace_cannot_fetch_store_register (int regno
)
168 return (ppc_register_u_addr (regno
) == -1);
171 /* The Linux kernel ptrace interface for AltiVec registers uses the
172 registers set mechanism, as opposed to the interface for all the
173 other registers, that stores/fetches each register individually. */
175 fetch_altivec_register (int tid
, int regno
)
180 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
181 int vrregsize
= DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vr0_regnum
);
183 ret
= ptrace (PTRACE_GETVRREGS
, tid
, 0, ®s
);
188 have_ptrace_getvrregs
= 0;
191 perror_with_name ("Unable to fetch AltiVec register");
194 /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
195 long on the hardware. We deal only with the lower 4 bytes of the
196 vector. VRSAVE is at the end of the array in a 4 bytes slot, so
197 there is no need to define an offset for it. */
198 if (regno
== (tdep
->ppc_vrsave_regnum
- 1))
199 offset
= vrregsize
- DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vrsave_regnum
);
201 supply_register (regno
,
202 regs
+ (regno
- tdep
->ppc_vr0_regnum
) * vrregsize
+ offset
);
206 fetch_register (int tid
, int regno
)
208 /* This isn't really an address. But ptrace thinks of it as one. */
209 char mess
[128]; /* For messages */
211 unsigned int offset
; /* Offset of registers within the u area. */
212 char buf
[MAX_REGISTER_SIZE
];
213 CORE_ADDR regaddr
= ppc_register_u_addr (regno
);
215 if (altivec_register_p (regno
))
217 /* If this is the first time through, or if it is not the first
218 time through, and we have comfirmed that there is kernel
219 support for such a ptrace request, then go and fetch the
221 if (have_ptrace_getvrregs
)
223 fetch_altivec_register (tid
, regno
);
226 /* If we have discovered that there is no ptrace support for
227 AltiVec registers, fall through and return zeroes, because
228 regaddr will be -1 in this case. */
233 memset (buf
, '\0', DEPRECATED_REGISTER_RAW_SIZE (regno
)); /* Supply zeroes */
234 supply_register (regno
, buf
);
238 for (i
= 0; i
< DEPRECATED_REGISTER_RAW_SIZE (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
241 *(PTRACE_XFER_TYPE
*) & buf
[i
] = ptrace (PT_READ_U
, tid
,
242 (PTRACE_ARG3_TYPE
) regaddr
, 0);
243 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
246 sprintf (mess
, "reading register %s (#%d)",
247 REGISTER_NAME (regno
), regno
);
248 perror_with_name (mess
);
251 supply_register (regno
, buf
);
255 supply_vrregset (gdb_vrregset_t
*vrregsetp
)
258 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
259 int num_of_vrregs
= tdep
->ppc_vrsave_regnum
- tdep
->ppc_vr0_regnum
+ 1;
260 int vrregsize
= DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vr0_regnum
);
261 int offset
= vrregsize
- DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vrsave_regnum
);
263 for (i
= 0; i
< num_of_vrregs
; i
++)
265 /* The last 2 registers of this set are only 32 bit long, not
266 128. However an offset is necessary only for VSCR because it
267 occupies a whole vector, while VRSAVE occupies a full 4 bytes
269 if (i
== (num_of_vrregs
- 2))
270 supply_register (tdep
->ppc_vr0_regnum
+ i
,
271 *vrregsetp
+ i
* vrregsize
+ offset
);
273 supply_register (tdep
->ppc_vr0_regnum
+ i
, *vrregsetp
+ i
* vrregsize
);
278 fetch_altivec_registers (int tid
)
283 ret
= ptrace (PTRACE_GETVRREGS
, tid
, 0, ®s
);
288 have_ptrace_getvrregs
= 0;
291 perror_with_name ("Unable to fetch AltiVec registers");
293 supply_vrregset (®s
);
297 fetch_ppc_registers (int tid
)
300 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
302 for (i
= 0; i
<= tdep
->ppc_fpscr_regnum
; i
++)
303 fetch_register (tid
, i
);
304 if (tdep
->ppc_mq_regnum
!= -1)
305 fetch_register (tid
, tdep
->ppc_mq_regnum
);
306 if (have_ptrace_getvrregs
)
307 if (tdep
->ppc_vr0_regnum
!= -1 && tdep
->ppc_vrsave_regnum
!= -1)
308 fetch_altivec_registers (tid
);
311 /* Fetch registers from the child process. Fetch all registers if
312 regno == -1, otherwise fetch all general registers or all floating
313 point registers depending upon the value of regno. */
315 fetch_inferior_registers (int regno
)
317 /* Overload thread id onto process id */
318 int tid
= TIDGET (inferior_ptid
);
320 /* No thread id, just use process id */
322 tid
= PIDGET (inferior_ptid
);
325 fetch_ppc_registers (tid
);
327 fetch_register (tid
, regno
);
330 /* Store one register. */
332 store_altivec_register (int tid
, int regno
)
337 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
338 int vrregsize
= DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vr0_regnum
);
340 ret
= ptrace (PTRACE_GETVRREGS
, tid
, 0, ®s
);
345 have_ptrace_getvrregs
= 0;
348 perror_with_name ("Unable to fetch AltiVec register");
351 /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
352 long on the hardware. */
353 if (regno
== (tdep
->ppc_vrsave_regnum
- 1))
354 offset
= vrregsize
- DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vrsave_regnum
);
356 regcache_collect (regno
,
357 regs
+ (regno
- tdep
->ppc_vr0_regnum
) * vrregsize
+ offset
);
359 ret
= ptrace (PTRACE_SETVRREGS
, tid
, 0, ®s
);
361 perror_with_name ("Unable to store AltiVec register");
365 store_register (int tid
, int regno
)
367 /* This isn't really an address. But ptrace thinks of it as one. */
368 CORE_ADDR regaddr
= ppc_register_u_addr (regno
);
369 char mess
[128]; /* For messages */
371 unsigned int offset
; /* Offset of registers within the u area. */
372 char buf
[MAX_REGISTER_SIZE
];
374 if (altivec_register_p (regno
))
376 store_altivec_register (tid
, regno
);
383 regcache_collect (regno
, buf
);
384 for (i
= 0; i
< DEPRECATED_REGISTER_RAW_SIZE (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
387 ptrace (PT_WRITE_U
, tid
, (PTRACE_ARG3_TYPE
) regaddr
,
388 *(PTRACE_XFER_TYPE
*) & buf
[i
]);
389 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
392 && regno
== gdbarch_tdep (current_gdbarch
)->ppc_fpscr_regnum
)
394 /* Some older kernel versions don't allow fpscr to be written. */
400 sprintf (mess
, "writing register %s (#%d)",
401 REGISTER_NAME (regno
), regno
);
402 perror_with_name (mess
);
408 fill_vrregset (gdb_vrregset_t
*vrregsetp
)
411 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
412 int num_of_vrregs
= tdep
->ppc_vrsave_regnum
- tdep
->ppc_vr0_regnum
+ 1;
413 int vrregsize
= DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vr0_regnum
);
414 int offset
= vrregsize
- DEPRECATED_REGISTER_RAW_SIZE (tdep
->ppc_vrsave_regnum
);
416 for (i
= 0; i
< num_of_vrregs
; i
++)
418 /* The last 2 registers of this set are only 32 bit long, not
419 128, but only VSCR is fetched as a 16 bytes quantity. */
420 if (i
== (num_of_vrregs
- 2))
421 regcache_collect (tdep
->ppc_vr0_regnum
+ i
,
422 *vrregsetp
+ i
* vrregsize
+ offset
);
424 regcache_collect (tdep
->ppc_vr0_regnum
+ i
, *vrregsetp
+ i
* vrregsize
);
429 store_altivec_registers (int tid
)
434 ret
= ptrace (PTRACE_GETVRREGS
, tid
, 0, ®s
);
439 have_ptrace_getvrregs
= 0;
442 perror_with_name ("Couldn't get AltiVec registers");
445 fill_vrregset (®s
);
447 if (ptrace (PTRACE_SETVRREGS
, tid
, 0, ®s
) < 0)
448 perror_with_name ("Couldn't write AltiVec registers");
452 store_ppc_registers (int tid
)
455 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
457 for (i
= 0; i
<= tdep
->ppc_fpscr_regnum
; i
++)
458 store_register (tid
, i
);
459 if (tdep
->ppc_mq_regnum
!= -1)
460 store_register (tid
, tdep
->ppc_mq_regnum
);
461 if (have_ptrace_getvrregs
)
462 if (tdep
->ppc_vr0_regnum
!= -1 && tdep
->ppc_vrsave_regnum
!= -1)
463 store_altivec_registers (tid
);
467 store_inferior_registers (int regno
)
469 /* Overload thread id onto process id */
470 int tid
= TIDGET (inferior_ptid
);
472 /* No thread id, just use process id */
474 tid
= PIDGET (inferior_ptid
);
477 store_register (tid
, regno
);
479 store_ppc_registers (tid
);
483 supply_gregset (gdb_gregset_t
*gregsetp
)
485 ppc_linux_supply_gregset ((char *) gregsetp
);
489 fill_gregset (gdb_gregset_t
*gregsetp
, int regno
)
492 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
493 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
495 for (regi
= 0; regi
< 32; regi
++)
497 if ((regno
== -1) || regno
== regi
)
498 regcache_collect (regi
, regp
+ PT_R0
+ regi
);
501 if ((regno
== -1) || regno
== PC_REGNUM
)
502 regcache_collect (PC_REGNUM
, regp
+ PT_NIP
);
503 if ((regno
== -1) || regno
== tdep
->ppc_lr_regnum
)
504 regcache_collect (tdep
->ppc_lr_regnum
, regp
+ PT_LNK
);
505 if ((regno
== -1) || regno
== tdep
->ppc_cr_regnum
)
506 regcache_collect (tdep
->ppc_cr_regnum
, regp
+ PT_CCR
);
507 if ((regno
== -1) || regno
== tdep
->ppc_xer_regnum
)
508 regcache_collect (tdep
->ppc_xer_regnum
, regp
+ PT_XER
);
509 if ((regno
== -1) || regno
== tdep
->ppc_ctr_regnum
)
510 regcache_collect (tdep
->ppc_ctr_regnum
, regp
+ PT_CTR
);
512 if (((regno
== -1) || regno
== tdep
->ppc_mq_regnum
)
513 && (tdep
->ppc_mq_regnum
!= -1))
514 regcache_collect (tdep
->ppc_mq_regnum
, regp
+ PT_MQ
);
516 if ((regno
== -1) || regno
== tdep
->ppc_ps_regnum
)
517 regcache_collect (tdep
->ppc_ps_regnum
, regp
+ PT_MSR
);
521 supply_fpregset (gdb_fpregset_t
* fpregsetp
)
523 ppc_linux_supply_fpregset ((char *) fpregsetp
);
526 /* Given a pointer to a floating point register set in /proc format
527 (fpregset_t *), update the register specified by REGNO from gdb's
528 idea of the current floating point register set. If REGNO is -1,
531 fill_fpregset (gdb_fpregset_t
*fpregsetp
, int regno
)
534 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
536 for (regi
= 0; regi
< 32; regi
++)
538 if ((regno
== -1) || (regno
== FP0_REGNUM
+ regi
))
539 regcache_collect (FP0_REGNUM
+ regi
, (char *) (*fpregsetp
+ regi
));
541 if ((regno
== -1) || regno
== tdep
->ppc_fpscr_regnum
)
542 regcache_collect (tdep
->ppc_fpscr_regnum
, (char *) (*fpregsetp
+ regi
));
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